1697. Biprism Assembly,
Designed as an experimental unit for class room work in degree science laboratories, the biprism assembly is assembled from the following standardised components.
a) Optical Bench, 1½ metre long mild steel
b) One Universal lens holder spring type,
c) One Micrometer Eye-piece
d) One Adjustable Slit, True precision ground Stainless Steel jaws having spring action opening the jaws uniformly all along through a milled head.
e) Biprism Holder, having fine radial motion by a fine pitch screw.

1698. Biprism Fresnels,
Low angle in velvet lined box,
Size 30x40 mm and 40x50 mm

1699. Nodal Slide Assembly,
Designed as an experimental unit for Degree Science Laboratories. The assembly is assembled with the following components.
i) Optical Bench, 1½ meter long
ii) NodaI Slide Unit "RAC"
This consists of a combination of single and double lens holder on a mounting, capable of rotating along the vertical axis. The combination lens holders are adjustable in height and the single and twin lens holders can either be moved by Rack and Pinion or relative to each other by sliding. These motions are read by individual pointers on a scale. The whole mount can rotate along its vertical axis and the degree of rotation can be read on a circular scale.
iii) Mirror, plane tiltable.
iv) Metal white screen with cross slit.
v) Lamp housing,
metallic. Complete as described above on Optical Bench with mild steel Bars.

1700. Advanced Research Optical Bench,
"RAC" Deluxe Model
a) Specifications:
The bed is a heavy cast channel 180x12 cms app., provided with strengthening ribs which besides seasoning also help avoid development of any warping in use.
The guideways are machined and machine ground into a 'V' and a plain in one operation. A special slanting flat is machined to take the scale, which is divided in mms to a length 170 cms. The verniers fitted to the carriages (sliders) have precision ground edges carefully matched with scale to give fine accurate readings.
Sliders, Four carriages are provided to carry the Standard accessories. The carriages have their under surfaces machined true to fit the bed guideways, and these are then jointly interlapped to give perfectly smooth sliding. Two of the four sliders are having fine slow motion in all the four planes, which makes the adjustment more precise and accurate. The following slow motions are provided in the sliders (carriages)
a) Lateral transverse motion actuated by fine milled micrometer in all the four sliders.
b) Circular motion, a tangent screw is provided to rotate the pillar holding the accessory through 180° . Provided in two sliders only.
c) Height adjustment, by means of a slow motion screw head to raise or lower the accessory provided in all the four sliders.
d) Linier fine motion :-
two sliders are provided with fine (slow) motion by a Knurled Screw head thus providing the most accurate adjustment. All the motions are provided with scales and Verniers (as shown in diag.)

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